well, I don't know what to say... I will go to a service and have the phone checked, maybe it's another problem. I bought it as locked on Vodafone UK, but I do not have a Vodafone UK SIM to try it out, and other SIMs don't get any signal, and on a manul search no network is found, altrought at the begin the pin is requested and I can change the pin form the settings menu

thanks for all the answers